Nunchaku and Sai: Ancient Okinawan Martial Arts documents the origin, techniques, and historical applications of the nunchaku and sai, two traditional Okinawan weapons. The book explains how everyday objects were transformed into effective self?defense tools under governmental restrictions. Sakagami describes weapon construction, technical applications, kata sequences, and strategic principles within traditional Okinawan kobud?. Photographs and illustrations support explanations of grips, strikes, blocks, and combinations, providing practical guidance for martial arts practitioners. The text combines historical context with technical analysis and instructional guidance. The work offers a systematic and historical analysis of the nunchaku and sai within traditional Okinawan martial arts. Ryusho Sakagami places the weapons in cultural context, outlines their historical development, and explains the technical principles of usage, kata, and movement patterns. The text details how ordinary objects were adapted into weapons, examines body mechanics, distance management (ma?ai), and the application of techniques in both practice and confrontation. Photographs and illustrations clarify grips, strikes, blocks, and combinations, while emphasizing the continuity of traditional techniques and their pedagogical value for contemporary practitioners. The book is both historically informative and didactically structured, providing an academically rigorous reconstruction of Okinawan weapon techniques. Ryusho Sakagami was an Okinawan martial artist and recognized authority on Ryukyu kobud?. He contributed to the preservation and international dissemination of traditional weapon techniques, particularly the nunchaku and sai. His work has been widely referenced by martial arts practitioners and has played a key role in documenting and standardizing classical Okinawan weapon practices.